Luke Childs.

Cofounder & CTO at Umbrel
Also building anzen.sh
Previously: BitcoinJS, Browserify.

Thoughts

Solving Bitcoin's Self-Custody Trilemma — 7th August 2026

Nimdolf — non-interactive mint delegation on liveness failure

Kapow — Bitcoin finality guarantees for the Liquid Network

DLC Atomic Bribe Contract — how to cheat in discreet log contracts

Trust-Minimized Ecash — ecash mints funded via a self-custodial credit system

keyv — lightweight key-value storage adapter · 7.5B downloads

cacheable-request — transparent HTTP cache layer · 4.8B downloads

assert — Node.js assert polyfill for browsers · 4.5B downloads

CVE-2025-43855 — tRPC 11 WebSocket denial of service

CVE-2017-20199 — Buttercup Password Manager credential exfiltration

CVE-2017-20200 — Coinomi Cryptocurrency Wallet insecure communication

electrum.lu.ke — public Electrum server

bdn.lu.ke — BDN instance

tor-exit.lu.ke — Tor exit node